LIQUID WITHDRAWAL DEVICE For Liquid Nitrogen 25, 35 and 50 LD/LDB Dewars The Liquid Withdrawal Device (LWD) provides convenient pressure transfers of liquid nitrogen from 25, 35 and 50 LD/LDB Dewars. The device clamps directly to the special neck flange that is found under the plastic trim collar around the neck of these containers. Flow rates up to 8 liters per minutes are possible at operating pressures up to 6.5 psig (0.45 bar/45 kPa). Liquid can be dispensed directly from the LWD via the spout provided, or through a standard cryogenic hose connected to the liquid outlet. SAFETY Before using this equipment, read these instructions carefully. Also, read and understand the user manual supplied with your Dewar. The user manual gives detailed health and safety information. Additional copies of these publications can be obtained from your supplier. Do not modify LWD or Dewar or use in a manner other than that described in accompanying instructions and documentation. Contact with liquid nitrogen or cold gas may cause serious freezing (frostbite) injury. Do not touch liquid or cold metal surfaces with your bare skin. Always wear a face shield and gloves when transferring liquid nitrogen. Nitrogen gas can cause suffocation without warning. In a confined area, nitrogen gas from this equipment may displace air required for breathing. Store and use this equipment only in well-ventilated areas. Use only containers designed for low-temperature liquids. Cryogenic containers should be filled SLOWLY to minimize stresses which can damage the container. Vent all pressure from a Dewar before attempting to remove the Liquid Withdrawal Device. If the band clamp securing the LWD to a Dewar is loosened while there is pressure in the Dewar, cold gas or liquid could be expelled causing personal injury. Liquid Withdrawal Device is for use with liquid nitrogen only. LWD is for use on specific ICBiomedical Dewars - Models LD25, LD35 and LD 50. Pressure in Dewar with LWD installed should never exceed 6.5 psig (0.45 bar/45 kPa). Fill Dewar from supply source at 22 psig (1.52 bar/152 kPa) or less. Do not pressurize using compressed air.

ICBiomedical INSTALLATION 1. Remove the necktube cap/core from the Dewar 2. Remove 3 flat-head mounting screws in the base of the plastic trim collar (Figure 1) around the neck of the Dewar, remove the collar and discard or save for later. It is not used while the LWD is installed. - Breaking off the tube at point 3. the third score from the bottom of the tube is for use with the newer 25LD vessels. Discard any removed pieces. 4. Insert the longer plastic tube into the underside of the flange assembly, beneath the LIQUID valve. Insert the shorter plastic tube into the threaded fitting on the...

8. Carefully lower the LWD unit into the Dewar. The LWD should rest firmly centered on the neck flange of the Dewar; the liquid withdrawal tube should not touch the bottom of the Dewar. 9. Place the band clamp around the flange of both the LWD unit and the Dewar. Be sure that the clamp is properly engaged on both flanges. Tighten the clamp - hand tighten only. 10. Attach the snap of the safety cable to the ring on the LWD (see figure 2 next page). 11. If the spout assembly is to be used, install it on the outlet fitting above the LIQUID valve. The phase separator will ensure a controlled flow...

LIQUID WITHDRAWAL DEVICE Loosen the hose connection slowly and allow all pressure and any remaining liquid to dissipate before completely disconnecting the hose. SAFETY RING FLANGE O-RING V-BAND CLAMP SAFETY CABLE Liquid Withdrawal — when the liquid valve is opened, pressure in the Dewar forces liquid to go up through the withdrawal tube and out through the valve. The liquid nitrogen can be dispensed through the spout or through the transfer hose connected to the liquid outlet. Pressure Building — If the Dewar is filled properly, liquid nitrogen evaporation will maintain a pressure suffi cient...

Ordering Information - Order all replacement parts and accessories from your distributor. Please include the part and model number of your dewar, quantity, and description of each part requested. For more information, contact ICBiomedical at the address listed.